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The answer, at least a partial one: eggs. Eggs, specifically egg yolks, play several roles in homemade ice cream. You can make tasty ice cream without them, but there's a reason that almost every recipe published in the last 50 years calls for them. After water, egg yolks are mostly fat and protein.
Custard ice cream is, as the name suggests, made from a custard base. Egg yolks or whole eggs are whisked together with hot milk or cream and sugar, and cooked gently until the mixture becomes thick enough to coat the back of a spoon.